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So the original buildtak surface started to bubble ? I read about some people peel the buildtak off so the glass sit right on top of the heated bed, no buildtak in between. Some put thermal pad Or if yours comes with a spare buildtak (mine comes with a spare) maybe it's time to change it.

Mine still have the original buildtak on and when I do bed leveing, I have my bed heated up to normal printing temp, like 57C, My buildtak also have some uneven surface, hence I use the glass, luckily I didn't encounter such problem. I adjust the Z stop switch to a level when I put the glass on and did a home Z, the bed is level and most important the 4 adjustment screws was tighten up to a point the spring has tension to hold itself and doesn't come loose during print and doesn't bend the bottom flimsy Y carriage plate. Oh. I also printed 2 of the LM8UU and mount for one side of the Y rod, the original design has 2 LM8UU mount on one rod and the other rod only got one, now it has 3 on that rod - that is to prevent the bending of the cheap Y carriage plate the printer comes with. With this setup, I didn't have to level my bed for quite some time already.

Glad you like the clamp, but sorry it doesn't work for you.